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Finite element simulation of package stress in transfer molded MEMS pressure sensors

Identifieur interne : 002F15 ( Main/Exploration ); précédent : 002F14; suivant : 002F16

Finite element simulation of package stress in transfer molded MEMS pressure sensors

Auteurs : Rudolf Krondorfer [Norvège] ; Yeong K. Kim [Corée du Sud] ; JAEOK KIM [Corée du Sud] ; Claes-G Ran Gustafson [Norvège] ; Timothy C. Lommasson [Norvège]

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Abstract

The goal of this paper is to investigate the effect of residual packaging stress resulting from transfer molding of a micro electro mechanical system pressure sensor. A model of a silicon diaphragm micro electro mechanical system pressure sensor geometry was used to simulate the stresses developed during the molding process. The analyses were carried out with an assumption that the epoxy molding compound was a temperature dependent elastic material. Finite element analysis was used to-calculate the residual packaging stress. The stress values were used to obtain the electrical output signal and sensitivity of the packaged sensor. In this way, a direct link was established between package stress and device performance. The calculated output signal and sensitivity were compared with experimental data to verify the simulated stress and hence determine the effect of the packaging process on the pressure sensor. Four different service temperatures were considered to examine the temperature effects on the output signal and the sensitivity for the packaged sensor.


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Le document en format XML

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<term>Micromachine</term>
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<term>Capteur pression</term>
<term>Capteur mesure</term>
<term>Contrainte résiduelle</term>
<term>Moulage transfert</term>
<term>Micromachine</term>
<term>Diaphragme</term>
<term>Encapsulation plastique</term>
<term>Effet température</term>
<term>Signal électrique</term>
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<front>
<div type="abstract" xml:lang="en">The goal of this paper is to investigate the effect of residual packaging stress resulting from transfer molding of a micro electro mechanical system pressure sensor. A model of a silicon diaphragm micro electro mechanical system pressure sensor geometry was used to simulate the stresses developed during the molding process. The analyses were carried out with an assumption that the epoxy molding compound was a temperature dependent elastic material. Finite element analysis was used to-calculate the residual packaging stress. The stress values were used to obtain the electrical output signal and sensitivity of the packaged sensor. In this way, a direct link was established between package stress and device performance. The calculated output signal and sensitivity were compared with experimental data to verify the simulated stress and hence determine the effect of the packaging process on the pressure sensor. Four different service temperatures were considered to examine the temperature effects on the output signal and the sensitivity for the packaged sensor.</div>
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